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Answer:
Couplet
Explanation:
Taxonomic Key
A taxonomic is a tool used by scientists to identify and organism. It consists of a series of contradictory statements or questions that eventually lead to the classification of the organism. Choosing the appropriate option in each of the statements gives a detailed description of an organism's characteristics that help in its identification.
This pair of contradictory statements is called a couplet and each statement in a couplet is called a lead.
For a plant, the follow contradictory statements will be called a couplet:
1. Seed colour: Black
1. Seed colour: white
2. Plant height: Tall
2. Plant height: short
Answer:
The correct answer should be the second option, that is, Onion root tip cells do not undergo anaphase 1.
Anaphase I is a part of meiosis which occurs only in cells involved in reproduction. For example, gametes.
Onion root tip cells undergo mitosis.
The chromosome can be observed using compound microscope.
Thus, all other options are incorrect except second option.
